import json
import yaml
import os.path
from ate.exception import ParamsError

def load_yaml_file(yaml_file):
    with open(yaml_file, 'r+') as stream:
        return yaml.load(stream)

def load_json_file(json_file):
    with open(json_file) as data_file:
        return json.load(data_file)

def load_testcases(testcase_file_path):
    file_suffix = os.path.splitext(testcase_file_path)[1]
    if file_suffix == '.json':
        return load_json_file(testcase_file_path)
    elif file_suffix in ['.yaml', '.yml']:
        return load_yaml_file(testcase_file_path)
    else:
        # '' or other suffix
        raise ParamsError("Bad testcase file name!")